Shield assemblies for installation in under-ground roadways and

Details Shield assemblies for installation in under-ground roadways and Shield assemblies for installation in under-ground roadways and

1979-11-30

1981-09-15

Purser, Ernest R.

Mining or in situ disintegration of hard material

Hard material disintegrating machines

With mine roof-supporting means

405142, E21D 908

Patent

active

042893569

ABSTRACT:
A shield assembly for installation in an underground roadway or tunnel comprises an articulated upper shield assembly, a lower shield assembly and a plurality of hydraulic rams for urging the upper shield assembly upwards relatively to the lower shield assembly, a telescopic arrangement being provided which guides the upper shield assembly in a direction along the roadway or tunnel but which allows the end margins of the upper shield assembly to move outwardly relative to the end margins of the lower shield assembly.

REFERENCES:
patent: 3870368 (1975-03-01), Winberg

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